Click it instead of tracing it
Most unwanted objects have a clear boundary: a bottle on a table, a cone on a pavement, a chair in a room. Tracing that boundary with a brush is slow and inaccurate; clicking it should be enough. Smart Select uses a promptable segmentation model running in your browser. When you open Smart Select, the photo is analysed once into a compact internal representation that stays in the tab. Every click after that asks only a small, fast part of the model “what object is under this point?”, and the outline appears.
A single click is often ambiguous — did you mean the shirt or the person, the cup or the whole tray? So Smart Select gives up to three outlines, labelled Smaller, Medium and Larger, with its confidence beside each. Pick the right one. For objects with several colours or awkward shapes, drag a loose stroke through them instead of clicking, or Shift-drag a box around them.
Then make it exact
No automatic outline is perfect, and you stay in control: switch to Add area or Remove area and click again, or touch up with the brush in Add or Subtract mode. Expand and Contract move the whole edge by a few pixels. When you press Erase, the selection is grown by a small margin scaled to the object's size — the Tight, Normal and Generous setting — because a mask that stops exactly at an edge tends to leave a faint outline behind.
Several objects at once
Select as many objects as you like. EraseObject splits them into separate pieces and rebuilds each from its own surroundings, one at a time, which keeps the context each one gets as large as possible.